Bone Lake (2024)

Couple Sage and Diego arrive at a large lakeside country house they have rented for the weekend. Sage has recently taken an editing job to support Diego so he can pursue a full-time writing career, and the two plan to celebrate before Diego begins working on a novel. Shortly after arriving, Sage and Diego are met by outgoing couple Will and Cin, who also booked the house. Realizing the house has been double-booked, Sage and Diego agree to spend the weekend sharing the house with Will and Cin.

The couples spend the day swimming in Bone Lake and cooking. Will recounts how, beginning in the 1950s, an unknown serial killer used Bone Lake as a dumping site for victims. Cin and Will make sexual advances toward Diego and Sage, respectively. Will discovers Diego plans to propose to Sage over the weekend with his grandmother's wedding ring. Later that night, Will and Cin suggest that the couples break into a series of locked rooms they have found in the house. In one, they discover various sex toys and a sex swing; in the other, they find a Ouija board and several newspaper clippings about disappearances that have occurred around the lake.

The following morning at breakfast, Will unexpectedly proposes to Cin using Diego's grandmother's ring, which he has stolen. Diego confronts him privately, and Will apologizes, claiming Cin is cheating on him and that he stole the ring out of desperation; Diego reveals that Sage cheated on him early into their relationship and that he sympathizes. Will promises to return the ring before the weekend's end. Sage accompanies Will into town to buy groceries, during which he says Diego told him he had caught Sage masturbating in the bathtub, and that Diego fears he cannot sexually please her. Will then makes sexual advances toward Sage. Meanwhile, Cin attempts to seduce Diego at the house.

Later that night, Cin proposes that she and Sage take molly together, which Sage agrees to. Later, when Diego confronts Sage, she confesses she feigned taking the drug, and believes that Will and Cin are attempting to psychologically manipulate them and turn them against each other. Diego and Sage attempt to leave in their electric car, but discover the charger has been unplugged and the battery has only six miles of range left. Will confronts the two, claiming to Diego that he had sex with Sage earlier. Sage denies this, and Diego attempts to back the car out of the driveway, only for them to be struck by Cin in her vehicle.

Sage and Diego awaken in the house, bound with duct tape. Will and Cin reveal that they are in fact Thomas and Alice Price, siblings of a prosperous publishing family. While teenagers, the siblings began an incestuous relationship, and murdered their parents when it was discovered. The two have since terrorized six different couples at their familial estate, putting them through psychological mind games testing the strength of their relationships before killing them. Sage and Diego attempt to flee, and Sage is pursued by Cin, brandishing a butcher knife. Sage manages to strike Cin with a glass, cutting her face, before Will chases after her. Arming herself with an axe, Sage is confronted by Will, who challenges her to strike him in the head before taking control of the axe. Meanwhile, Diego hides under the boat dock, where he stabs Cin through the foot, trapping her.

Will, now armed with an electric chainsaw, attempts to kill Diego, but Sage strikes him through the head with the axe, killing him. Sage and Diego attempt to flee on a boat, where Cin attacks them. Diego strikes Cin in the hand with the axe, dismembering her fingers, before she falls into the water and gets her hair caught in the propeller. Sage reverses the boat, engaging the propeller, effectively killing Cin. Later, while floating on the lake, Diego removes his grandmother's ring from Cin's dismembered finger and proposes to Sage. The two begin laughing hysterically, before staring off in silence.